java.lang.NullPointerException
        at java.util.Arrays$ArrayList.<init>(Arrays.java:3357)
        at java.util.Arrays.asList(Arrays.java:3343)
        at org.netbeans.modules.xml.wsdl.ui.api.property.ChooserHelper.recursiveListFiles(ChooserHelper.java:176)
        at org.netbeans.modules.xml.wsdl.ui.api.property.ElementOrTypeChooserHelper$SchemaProjectFolderChildren.resetKeys(ElementOrTypeChooserHelper.java:278)
        at org.netbeans.modules.xml.wsdl.ui.api.property.ElementOrTypeChooserHelper$SchemaProjectFolderChildren.addNotify(ElementOrTypeChooserHelper.java:261)
        at org.openide.nodes.Children.callAddNotify(Children.java:541)
        at org.openide.nodes.Children.getArray(Children.java:583)
        at org.openide.nodes.Children.getNodes(Children.java:491)
        at org.openide.nodes.FilterNode$Children.getNodes(FilterNode.java:1470)
        at org.openide.explorer.view.TreeView$2.run(TreeView.java:847)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)